Algorithm that reads three numbers and displays the result of the sum of the first two and multiplied by the third

Question

Follow my code below, however does not return correct the result, if I put as input 2, 2, 3 was to appear 12, but appears 6

public class Exercicio2 {

@SuppressWarnings("unused")
public static void main(String[] args) {
    Scanner entrada = new Scanner(System.in);
    int i = 0;
    int[] soma = new int[3];
    int numero1, numero2 = 0;
    int total = 0;
    while(i < 3){
        System.out.println("Informe um numero[" + i + "]");
        soma[i] = entrada.nextInt();
        soma[i] += soma[i];
        total = soma[i];
        i++;
    }
    System.out.println(total);
   }
 }

Answer 1

In this line

soma[i] += soma[i];

you are multiplying what has been entered by 2. That is, if you have entered 2 in index 0 you are doing sum[0] = sum[0] + sum[0]

What you should do is a cycle where you just log in:

for(int i = 0; i < 3; i++)
{
    System.out.println("Informe um numero[" + i + "]");
    soma[i] = entrada.nextInt();
}

And then you do the math:

total = (soma[0] + soma[1]) * soma[2];

Final code:

public class Exercicio2 {

@SuppressWarnings("unused")
public static void main(String[] args) {
    Scanner entrada = new Scanner(System.in);
    int[] soma = new int[3];
    int total = 0;
    for(int i = 0; i < 3; i++)
    {
        System.out.println("Informe um numero[" + i + "]");
        soma[i] = entrada.nextInt();
    }
    total = (soma[0] + soma[1]) * soma[2];
    System.out.println(total);
   }
 }

Answer 2

I would only have to check the steps taken by while, received the first number, incremented the variable i, and contains the value 1 it is because already received the first and the second number, then makes the sum, if it contains the value 2 is because it received the third so it makes the multiplication.

public static void main(String []args){
        Scanner entrada = new Scanner(System.in);
        int i = 0;
        // Alterei o nome da variavel, soma para numeros.
        int[] numeros = new int[3];
        // Criei outra variavel int com nome soma.
        int soma = 0;
        // int numero1, numero2 = 0; -> Não tem utilidade
        int total = 0;
        while(i < 3){
            System.out.println("Informe um numero[" + i + "]");
            numeros[i] = entrada.nextInt();
            // Verifica se já recebeu o primeiro numero, então faz a soma do primeiro com o segundo
            if (i == 1) {
                soma = numeros[0] + numeros[1];
            }
            // Ultima etapa, multiplica pelo terceiro.
            if (i == 2) {
                total = soma * numeros[i];
            }
            i++;
        }
        System.out.println(total);
    }